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'
'   VBS JSON 2.0.3
'   Copyright (c) 2009 Tuerul Topuz
'   Under the MIT (MIT-LICENSE.txt) license.
'
Const JSON_OBJECT   = 0
Const JSON_ARRAY    = 1
Class jsCore
    Public Collection
    Public Count
    Public QuotedVars
    Public Kind ' 0 = object, 1 = array
    Private Sub Class_Initialize
        Set Collection = CreateObject("Scripting.Dictionary")
        QuotedVars = True
        Count = 0
    End Sub
    Private Sub Class_Terminate
        Set Collection = Nothing
    End Sub
    ' counter
    Private Property Get Counter 
        Counter = Count
        Count = Count + 1
    End Property
    ' - data maluplation
    ' -- pair
    Public Property Let Pair(p, v)
        If IsNull(p) Then p = Counter
        Collection(p) = v
    End Property
    Public Property Set Pair(p, v)
        If IsNull(p) Then p = Counter
        If TypeName(v) <> "jsCore" Then
            Err.Raise &hD, "class: class", "Incompatible types: '" & TypeName(v) & "'"
        End If
        Set Collection(p) = v
    End Property
    Public Default Property Get Pair(p)
        If IsNull(p) Then p = Count - 1
        If IsObject(Collection(p)) Then
            Set Pair = Collection(p)
        Else
            Pair = Collection(p)
        End If
    End Property
    ' -- pair
    Public Sub Clean
        Collection.RemoveAll
    End Sub
    Public Sub Remove(vProp)
        Collection.Remove vProp
    End Sub
    ' data maluplation
    ' encoding
    Function jsEncode(str)
        Dim charmap(127), haystack()
        charmap(8)  = "\b"
        charmap(9)  = "\t"
        charmap(10) = "\n"
        charmap(12) = "\f"
        charmap(13) = "\r"
        charmap(34) = "\"""
        charmap(47) = "\/"
        charmap(92) = "\\"
        Dim strlen : strlen = Len(str) - 1
        ReDim haystack(strlen)
        Dim i, charcode
        For i = 0 To strlen
            haystack(i) = Mid(str, i + 1, 1)
            charcode = AscW(haystack(i)) And 65535
            If charcode < 127 Then
                If Not IsEmpty(charmap(charcode)) Then
                    haystack(i) = charmap(charcode)
                ElseIf charcode < 32 Then
                    haystack(i) = "\u" & Right("000" & Hex(charcode), 4)
                End If
            Else
                haystack(i) = "\u" & Right("000" & Hex(charcode), 4)
            End If
        Next
        jsEncode = Join(haystack, "")
    End Function
    ' converting
    Public Function toJSON(vPair)
        Select Case VarType(vPair)
            Case 0  ' Empty
                toJSON = "null"
            Case 1  ' Null
                toJSON = "null"
            Case 7  ' Date
                ' toJSON = "new Date(" & (vPair - CDate(25569)) * 86400000 & ")"    ' let in only utc time
                toJSON = """" & CStr(vPair) & """"
            Case 8  ' String
                toJSON = """" & jsEncode(vPair) & """"
            Case 9  ' Object
                Dim bFI,i 
                bFI = True
                If vPair.Kind Then toJSON = toJSON & "[" Else toJSON = toJSON & "{"
                For Each i In vPair.Collection
                    If bFI Then bFI = False Else toJSON = toJSON & ","
                    If vPair.Kind Then 
                        toJSON = toJSON & toJSON(vPair(i))
                    Else
                        If QuotedVars Then
                            toJSON = toJSON & """" & i & """:" & toJSON(vPair(i))
                        Else
                            toJSON = toJSON & i & ":" & toJSON(vPair(i))
                        End If
                    End If
                Next
                If vPair.Kind Then toJSON = toJSON & "]" Else toJSON = toJSON & "}"
            Case 11
                If vPair Then toJSON = "true" Else toJSON = "false"
            Case 12, 8192, 8204
                toJSON = RenderArray(vPair, 1, "")
            Case Else
                toJSON = Replace(vPair, ",", ".")
        End select
    End Function
    Function RenderArray(arr, depth, parent)
        Dim first : first = LBound(arr, depth)
        Dim last : last = UBound(arr, depth)
        Dim index, rendered
        Dim limiter : limiter = ","
        RenderArray = "["
        For index = first To last
            If index = last Then
                limiter = ""
            End If 
            On Error Resume Next
            rendered = RenderArray(arr, depth + 1, parent & index & "," )
            If Err = 9 Then
                On Error GoTo 0
                RenderArray = RenderArray & toJSON(Eval("arr(" & parent & index & ")")) & limiter
            Else
                RenderArray = RenderArray & rendered & "" & limiter
            End If
        Next
        RenderArray = RenderArray & "]"
    End Function
    Public Property Get jsString
        jsString = toJSON(Me)
    End Property
    Sub Flush
        If TypeName(Response) <> "Empty" Then 
            Response.Write(jsString)
        ElseIf WScript <> Empty Then 
            WScript.Echo(jsString)
        End If
    End Sub
    Public Function Clone
        Set Clone = ColClone(Me)
    End Function
    Private Function ColClone(core)
        Dim jsc, i
        Set jsc = new jsCore
        jsc.Kind = core.Kind
        For Each i In core.Collection
            If IsObject(core(i)) Then
                Set jsc(i) = ColClone(core(i))
            Else
                jsc(i) = core(i)
            End If
        Next
        Set ColClone = jsc
    End Function
End Class
Function jsObject
    Set jsObject = new jsCore
    jsObject.Kind = JSON_OBJECT
End Function
Function jsArray
    Set jsArray = new jsCore
    jsArray.Kind = JSON_ARRAY
End Function
Function toJSON(val)
    toJSON = (new jsCore).toJSON(val)
End Function
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